package cn.edu.ctbu.dp01.service;

import cn.edu.ctbu.dp01.constant.REnum;
import cn.edu.ctbu.dp01.dao.StudentRepository;
import cn.edu.ctbu.dp01.entity.Student;
import cn.edu.ctbu.dp01.exception.RException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Example;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.stereotype.Service;
import java.util.List;

@Service
public class StudentService {
    @Autowired
    public StudentRepository studentRepository;

    public List<Student> findAll() {
        return studentRepository.findAll();
    }

    public Student findById(Integer id) {
        return studentRepository.findById(id).get();
    }
//
//    public List<Student> findTopByOrderByIdDesc() {
//        return studentRepository.findTopByOrderByIdDesc();
//    }

//    public List<Student> findByNameLike(String name) {
//        return studentRepository.findTopByOrderByIdDesc();
//    }
    public List<Student> findByPassword(String password) {
        return studentRepository.findByPassword(password);
    }
    public List<Student> getAll(){
        return studentRepository.findAll();
    }
//    public void delete(Integer id) {
//        studentRepository.deleteById(id);
//    }
//分页
    public Page<Student> getAll(Pageable pageable){
        return studentRepository.findAll(pageable);
    }
    public Page<Student> getAll(Example<Student> example, Pageable pageable){
        return studentRepository.findAll(example,pageable);
    }

    /**
     * 新增学生
     * @param student
     * @return
     */
    public Student add(Student student) {
        return studentRepository.save(student);
    }
    /**
     * 更新学生
     * @param student
     * @return
     */
    public Student update(Student student) {
        return studentRepository.save(student);
    }
    /**
     * 删除学生
     * @param id
     * @return
     */
    public void delete(Integer id) {
        studentRepository.deleteById(id);
    }

    public Student validateUsernaneAndPasssword(String sno,String password) throws Exception {
        List<Student> students = studentRepository.findBySno(sno);
        if (students.size() > 0) {
            Student student = students.get(0);
            if (student.getPassword().equals(password)) {
                return student;
            } else {
                throw new RException(REnum.LOGIN_ERR);
            }
        } else {
            throw new RException(REnum.LOGIN_ERR);
        }
    }

}